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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
    p{
        width: 200px;
    }
    </style>
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<body>
    <!-- 格式化上下文是怎么样的  FC -->
    <p>
        It can get <strong>very complicated</strong> once you start looking into it
    </p>
    1. html创建 body参与共键 第一个BFC
    2. p block container  对内讲产生一个IFC 
        由于一行没办法完全显示，所以产生三个线盒(line box)
        line-height
    3. It can get  匿名的inline box
    4. very compicated  strong 标签产生的inline box
    5. once you 
    6. start looking into it 匿名的 inline box

</body> 
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